Lamp



FIG. 1 is a side elevation view of my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a rear elevation view thereof.

The broken lines shown on the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a lamp, as shown and described. 